Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90fd6e2d4d297ff…

MALICIOUS

PDF

81.9 KB Created: 2021-03-27 10:15:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b5b343257ad9dbc9e705c951079810e4 SHA-1: a2d4b2751a3b0511956ed8e926e080b953f2bcae SHA-256: e90fd6e2d4d297fffbf785a09e78d2323a3bdcc11d300c8131c3b7001f9fb46e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, identified as a link farm, with a primary URL pointing to a search result for academic material. This heuristic, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malicious content delivery attempt. The embedded links likely lead to sites designed to exploit users seeking specific documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/wix?keyword=fundamental+of+physics+9th+edition+solution+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451762/normal_60583527e1ceb.pdfIn PDF document text
    • https://gewewipuno.weebly.com/uploads/1/3/0/7/130775766/kixurexim_lasek_voxasuxefiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449410/normal_6044fd6ab72ba.pdfIn PDF document text
    • http://zokupez.mygamesonline.org/12338254272.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/zupivopivuruduginala.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468274/normal_600720c701a2c.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/weber_spirit_ii_e-310_lp_only_bbq_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380876/normal_5fc7009a21036.pdfIn PDF document text
    • https://bozoxemupep.weebly.com/uploads/1/3/4/3/134317316/wenujunafizax_soxoluz_jopamodugoseke_mozilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_6204b261875a4fed9713c71fa58ab4ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/the_maze_runner_2_full_movie_123movies.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/how_to_video_songs_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/international_trade_commission_trial_lawyers_association.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_6626602c5b6d4d85a96b5dd007e494ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/android_package_name_validation.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 5396 bytes
SHA-256: 90b7c38cf14b9f6897c4cccb7d11720b94da55e0b0af9a7bae52f9a5629b8b11
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 13060 bytes
SHA-256: eac0c578b0cfdfe939319101c1bfb1fcfbc3f33bb8a07d68324f1be7244b4545
font_02_sfnt_off00012a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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